Unless you've got some plug-ins that are interfering, Hal just fumbled out changing a word that all in capital letters, sometimes you'll get blank responses in the database because you've double press the enter key..
Unless this it recurring error this should not be a issue .
If it keeps on re-occurring every time you run Hal , the new main script may have got corrupted,, you may have to reinstall ultra HAL but remember to backup your brain files first;)
Look up a tutorial on how to do that on the forum.